package thread.synchronize.communication;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * 等待和通知
 *
 * @author cuihao
 * @date 2018/3/4
 */
public class WaitNotify {
    static boolean flag = true;
    static Object lock = new Object();

    public static void main(String[] args) {
        Thread waitThread = new Thread(new Wait(), "WaitTHread");
        waitThread.start();
        Thread notifyThread = new Thread(new Notify(), "NotifyThread");
        notifyThread.start();
    }

    static class Wait implements Runnable {
        @Override
        public void run() {
            synchronized (lock) {
                while (flag) {
                    try {
                        System.out.println(Thread.currentThread() + " flag is true wait @" +
                            new SimpleDateFormat("HH:mm:ss").format(new Date()));
                        lock.wait();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                System.out.println(Thread.currentThread() + " flag is false running @" +
                    new SimpleDateFormat("HH:mm:ss").format(new Date()));
            }
        }
    }

    static class Notify implements Runnable {
        @Override
        public void run() {
            synchronized (lock) {
                try {
                    System.out.println(Thread.currentThread() + " hold lock notify @" +
                        new SimpleDateFormat("HH:mm:ss").format(new Date()));
                    lock.notifyAll();
                    flag = false;
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            synchronized (lock) {
                System.out.println(Thread.currentThread() + " hold lock again @" +
                    new SimpleDateFormat("HH:mm:ss").format(new Date()));
            }
        }
    }
}
